Lot 1516
1959 3d Deep violet "Dollis Hill Phosphor Trial"....

Great Britain & Commonwealth | 5950
Auction: 21 April 2023 at 08:45 BST
Estimate: £60 - £70
Description
1959 3d Deep violet "Dollis Hill Phosphor Trial". Very fine perforated block of four on gummed crowns watermarked (upright) paper, with two 3mm blue phosphor bands printed over the ink. Spec. ST7(3)c.

